AirHint found the following cheapest return flights from Washington (DCA) to San Juan (SJU) in May 2026 (see full year).

Return flights

28 May - 02 Jun	jetBlue
29 May - 02 Jun	jetBlue
13 May - 20 May	United
01 May - 04 May	Southwest Airlines
04 May - 06 May	Delta
05 May - 08 May	Delta
11 May - 15 May	Delta
02 May - 05 May	Southwest Airlines
17 May - 20 May	United
01 May - 06 May	Southwest Airlines
23 May - 30 May	United
11 May - 14 May	Delta
27 May - 03 Jun	United
27 May - 05 Jun	United
27 May - 04 Jun	United
02 May - 03 Jun	Southwest Airlines
02 May - 06 Jun	United
30 May - 05 Jun	United
30 May - 03 Jun	Delta
29 May - 05 Jun	Southwest Airlines

Also check the deals for one-way flights from Washington to San Juan in May.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Washington to San Juan in May from 189€

Return flights